Like gay marriage, this doesn't threaten me or my marriage at all. I say let consenting adults have at it, with the following considerations:

They are full, legal marriages with all of the responsibilities as well as benefits.

All democrat-driven entitlement program (welfare, social security, etc...) formulas are all adjusted to reflect a "single household" situation. This means that "one man, three wives" doesn't pay out 300% of survivor benefits in the event of his death - they'll have to get by on 100% split X ways. Likewise legal protection for pension plans, insurance plans, etc...

Adjustments made as to the methodologies for distribution of assets in cases of divorce (I don't see where one of three wives is entitled to 50% of community property -, when no more than 25% should be the max) and probate matters.

Like adjustments to other financial aid situations (college aid, mortgage assistance, etc...) so as to not benefit members of larger single household situations.

With those considerations, let them have at it. That should immediately create a demand for new trailers with dedicated floorplans...

This is already legal (to some extent). Who says you can't have one wife and a shitload of girlfriends living in the same house? If wife #1 say it's ok, pour the coals to every vajaja you can con into the relationship.